Serving tray



FIG. 1 is a left end elevational view of a serving tray showing my new design;

FIG. 2 is a right end elevational view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a rear elevational view thereof; and

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a serving tray, as shown and described. 